In an attempt to obtain the Black Soulstone, Azmodan launched a full-scale siege on Bastion's Keep from the Arreat Crater. The Army of Sin nearly conquered the "impregnable" fortress, having slaughtered hundreds of defenders until Tyrael and his nephalem allies arrived to drive them back after they were tipped off by Leah via vision through the Black Soulstone. After the army's defeat, lesser demons were left to roam Sanctuary. Image:D1 item repair skill.jpg This section is a . You can help the Diablo Wiki to become more awesome by expanding it.